I was initially skeptical about WurkinStiffs. I had used collars for many years, metal collars at that, so I wasn't sure how adding a tiny powerful magnet would change my life. but he has brothers. No more 70's floppy collars, baby. No more tiny buttons on shirts that break or irritate. I started my addiction with a set of 2.5 inch devices. Now I'm addicted. I have so many shirts with different collar depths (yes, I still have 3 inch shirts hidden in the closet, right with tiny euro collars). I ordered a multi set so I have options. Boy I love options. The 2.5" goes pretty much anywhere, but sometimes I want to play around with the shirt. And as a plus, if you're wearing a tie or whatever, use it without a tiny magnet. like a regular stay-on.